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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/appletalk/ltpc.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/net/appletalk/ltpc.c')
-rw-r--r--drivers/net/appletalk/ltpc.c1313
1 files changed, 1313 insertions, 0 deletions
diff --git a/drivers/net/appletalk/ltpc.c b/drivers/net/appletalk/ltpc.c
new file mode 100644
index 000000000000..ad8e943231a1
--- /dev/null
+++ b/drivers/net/appletalk/ltpc.c
@@ -0,0 +1,1313 @@
1/*** ltpc.c -- a driver for the LocalTalk PC card.
2 *
3 * Copyright (c) 1995,1996 Bradford W. Johnson <johns393@maroon.tc.umn.edu>
4 *
5 * This software may be used and distributed according to the terms
6 * of the GNU General Public License, incorporated herein by reference.
7 *
8 * This is ALPHA code at best. It may not work for you. It may
9 * damage your equipment. It may damage your relations with other
10 * users of your network. Use it at your own risk!
11 *
12 * Based in part on:
13 * skeleton.c by Donald Becker
14 * dummy.c by Nick Holloway and Alan Cox
15 * loopback.c by Ross Biro, Fred van Kampen, Donald Becker
16 * the netatalk source code (UMICH)
17 * lots of work on the card...
18 *
19 * I do not have access to the (proprietary) SDK that goes with the card.
20 * If you do, I don't want to know about it, and you can probably write
21 * a better driver yourself anyway. This does mean that the pieces that
22 * talk to the card are guesswork on my part, so use at your own risk!
23 *
24 * This is my first try at writing Linux networking code, and is also
25 * guesswork. Again, use at your own risk! (Although on this part, I'd
26 * welcome suggestions)
27 *
28 * This is a loadable kernel module which seems to work at my site
29 * consisting of a 1.2.13 linux box running netatalk 1.3.3, and with
30 * the kernel support from 1.3.3b2 including patches routing.patch
31 * and ddp.disappears.from.chooser. In order to run it, you will need
32 * to patch ddp.c and aarp.c in the kernel, but only a little...
33 *
34 * I'm fairly confident that while this is arguably badly written, the
35 * problems that people experience will be "higher level", that is, with
36 * complications in the netatalk code. The driver itself doesn't do
37 * anything terribly complicated -- it pretends to be an ether device
38 * as far as netatalk is concerned, strips the DDP data out of the ether
39 * frame and builds a LLAP packet to send out the card. In the other
40 * direction, it receives LLAP frames from the card and builds a fake
41 * ether packet that it then tosses up to the networking code. You can
42 * argue (correctly) that this is an ugly way to do things, but it
43 * requires a minimal amount of fooling with the code in ddp.c and aarp.c.
44 *
45 * The card will do a lot more than is used here -- I *think* it has the
46 * layers up through ATP. Even if you knew how that part works (which I
47 * don't) it would be a big job to carve up the kernel ddp code to insert
48 * things at a higher level, and probably a bad idea...
49 *
50 * There are a number of other cards that do LocalTalk on the PC. If
51 * nobody finds any insurmountable (at the netatalk level) problems
52 * here, this driver should encourage people to put some work into the
53 * other cards (some of which I gather are still commercially available)
54 * and also to put hooks for LocalTalk into the official ddp code.
55 *
56 * I welcome comments and suggestions. This is my first try at Linux
57 * networking stuff, and there are probably lots of things that I did
58 * suboptimally.
59 *
60 ***/
61
62/***
63 *
64 * $Log: ltpc.c,v $
65 * Revision 1.1.2.1 2000/03/01 05:35:07 jgarzik
66 * at and tr cleanup
67 *
68 * Revision 1.8 1997/01/28 05:44:54 bradford
69 * Clean up for non-module a little.
70 * Hacked about a bit to clean things up - Alan Cox
71 * Probably broken it from the origina 1.8
72 *
73
74 * 1998/11/09: David Huggins-Daines <dhd@debian.org>
75 * Cleaned up the initialization code to use the standard autoirq methods,
76 and to probe for things in the standard order of i/o, irq, dma. This
77 removes the "reset the reset" hack, because I couldn't figure out an
78 easy way to get the card to trigger an interrupt after it.
79 * Added support for passing configuration parameters on the kernel command
80 line and through insmod
81 * Changed the device name from "ltalk0" to "lt0", both to conform with the
82 other localtalk driver, and to clear up the inconsistency between the
83 module and the non-module versions of the driver :-)
84 * Added a bunch of comments (I was going to make some enums for the state
85 codes and the register offsets, but I'm still not sure exactly what their
86 semantics are)
87 * Don't poll anymore in interrupt-driven mode
88 * It seems to work as a module now (as of 2.1.127), but I don't think
89 I'm responsible for that...
90
91 *
92 * Revision 1.7 1996/12/12 03:42:33 bradford
93 * DMA alloc cribbed from 3c505.c.
94 *
95 * Revision 1.6 1996/12/12 03:18:58 bradford
96 * Added virt_to_bus; works in 2.1.13.
97 *
98 * Revision 1.5 1996/12/12 03:13:22 root
99 * xmitQel initialization -- think through better though.
100 *
101 * Revision 1.4 1996/06/18 14:55:55 root
102 * Change names to ltpc. Tabs. Took a shot at dma alloc,
103 * although more needs to be done eventually.
104 *
105 * Revision 1.3 1996/05/22 14:59:39 root
106 * Change dev->open, dev->close to track dummy.c in 1.99.(around 7)
107 *
108 * Revision 1.2 1996/05/22 14:58:24 root
109 * Change tabs mostly.
110 *
111 * Revision 1.1 1996/04/23 04:45:09 root
112 * Initial revision
113 *
114 * Revision 0.16 1996/03/05 15:59:56 root
115 * Change ARPHRD_LOCALTLK definition to the "real" one.
116 *
117 * Revision 0.15 1996/03/05 06:28:30 root
118 * Changes for kernel 1.3.70. Still need a few patches to kernel, but
119 * it's getting closer.
120 *
121 * Revision 0.14 1996/02/25 17:38:32 root
122 * More cleanups. Removed query to card on get_stats.
123 *
124 * Revision 0.13 1996/02/21 16:27:40 root
125 * Refix debug_print_skb. Fix mac.raw gotcha that appeared in 1.3.65.
126 * Clean up receive code a little.
127 *
128 * Revision 0.12 1996/02/19 16:34:53 root
129 * Fix debug_print_skb. Kludge outgoing snet to 0 when using startup
130 * range. Change debug to mask: 1 for verbose, 2 for higher level stuff
131 * including packet printing, 4 for lower level (card i/o) stuff.
132 *
133 * Revision 0.11 1996/02/12 15:53:38 root
134 * Added router sends (requires new aarp.c patch)
135 *
136 * Revision 0.10 1996/02/11 00:19:35 root
137 * Change source LTALK_LOGGING debug switch to insmod ... debug=2.
138 *
139 * Revision 0.9 1996/02/10 23:59:35 root
140 * Fixed those fixes for 1.2 -- DANGER! The at.h that comes with netatalk
141 * has a *different* definition of struct sockaddr_at than the Linux kernel
142 * does. This is an "insidious and invidious" bug...
143 * (Actually the preceding comment is false -- it's the atalk.h in the
144 * ancient atalk-0.06 that's the problem)
145 *
146 * Revision 0.8 1996/02/10 19:09:00 root
147 * Merge 1.3 changes. Tested OK under 1.3.60.
148 *
149 * Revision 0.7 1996/02/10 17:56:56 root
150 * Added debug=1 parameter on insmod for debugging prints. Tried
151 * to fix timer unload on rmmod, but I don't think that's the problem.
152 *
153 * Revision 0.6 1995/12/31 19:01:09 root
154 * Clean up rmmod, irq comments per feedback from Corin Anderson (Thanks Corey!)
155 * Clean up initial probing -- sometimes the card wakes up latched in reset.
156 *
157 * Revision 0.5 1995/12/22 06:03:44 root
158 * Added comments in front and cleaned up a bit.
159 * This version sent out to people.
160 *
161 * Revision 0.4 1995/12/18 03:46:44 root
162 * Return shortDDP to longDDP fake to 0/0. Added command structs.
163 *
164 ***/
165
166/* ltpc jumpers are:
167*
168* Interrupts -- set at most one. If none are set, the driver uses
169* polled mode. Because the card was developed in the XT era, the
170* original documentation refers to IRQ2. Since you'll be running
171* this on an AT (or later) class machine, that really means IRQ9.
172*
173* SW1 IRQ 4
174* SW2 IRQ 3
175* SW3 IRQ 9 (2 in original card documentation only applies to XT)
176*
177*
178* DMA -- choose DMA 1 or 3, and set both corresponding switches.
179*
180* SW4 DMA 3
181* SW5 DMA 1
182* SW6 DMA 3
183* SW7 DMA 1
184*
185*
186* I/O address -- choose one.
187*
188* SW8 220 / 240
189*/
190
191/* To have some stuff logged, do
192* insmod ltpc.o debug=1
193*
194* For a whole bunch of stuff, use higher numbers.
195*
196* The default is 0, i.e. no messages except for the probe results.
197*/
198
199/* insmod-tweakable variables */
200static int debug;
201#define DEBUG_VERBOSE 1
202#define DEBUG_UPPER 2
203#define DEBUG_LOWER 4
204
205static int io;
206static int irq;
207static int dma;
208
209#include <linux/module.h>
210#include <linux/kernel.h>
211#include <linux/types.h>
212#include <linux/fcntl.h>
213#include <linux/interrupt.h>
214#include <linux/ptrace.h>
215#include <linux/ioport.h>
216#include <linux/spinlock.h>
217#include <linux/in.h>
218#include <linux/slab.h>
219#include <linux/string.h>
220#include <linux/errno.h>
221#include <linux/init.h>
222#include <linux/netdevice.h>
223#include <linux/etherdevice.h>
224#include <linux/skbuff.h>
225#include <linux/if_arp.h>
226#include <linux/if_ltalk.h>
227#include <linux/delay.h>
228#include <linux/timer.h>
229#include <linux/atalk.h>
230#include <linux/bitops.h>
231
232#include <asm/system.h>
233#include <asm/dma.h>
234#include <asm/io.h>
235
236/* our stuff */
237#include "ltpc.h"
238
239static DEFINE_SPINLOCK(txqueue_lock);
240static DEFINE_SPINLOCK(mbox_lock);
241
242/* function prototypes */
243static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
244 void *dbuf, int dbuflen);
245static int sendup_buffer (struct net_device *dev);
246
247/* Dma Memory related stuff, cribbed directly from 3c505.c */
248
249static unsigned long dma_mem_alloc(int size)
250{
251 int order = get_order(size);
252
253 return __get_dma_pages(GFP_KERNEL, order);
254}
255
256/* DMA data buffer, DMA command buffer */
257static unsigned char *ltdmabuf;
258static unsigned char *ltdmacbuf;
259
260/* private struct, holds our appletalk address */
261
262struct ltpc_private
263{
264 struct net_device_stats stats;
265 struct atalk_addr my_addr;
266};
267
268/* transmit queue element struct */
269
270struct xmitQel {
271 struct xmitQel *next;
272 /* command buffer */
273 unsigned char *cbuf;
274 short cbuflen;
275 /* data buffer */
276 unsigned char *dbuf;
277 short dbuflen;
278 unsigned char QWrite; /* read or write data */
279 unsigned char mailbox;
280};
281
282/* the transmit queue itself */
283
284static struct xmitQel *xmQhd, *xmQtl;
285
286static void enQ(struct xmitQel *qel)
287{
288 unsigned long flags;
289 qel->next = NULL;
290
291 spin_lock_irqsave(&txqueue_lock, flags);
292 if (xmQtl) {
293 xmQtl->next = qel;
294 } else {
295 xmQhd = qel;
296 }
297 xmQtl = qel;
298 spin_unlock_irqrestore(&txqueue_lock, flags);
299
300 if (debug & DEBUG_LOWER)
301 printk("enqueued a 0x%02x command\n",qel->cbuf[0]);
302}
303
304static struct xmitQel *deQ(void)
305{
306 unsigned long flags;
307 int i;
308 struct xmitQel *qel=NULL;
309
310 spin_lock_irqsave(&txqueue_lock, flags);
311 if (xmQhd) {
312 qel = xmQhd;
313 xmQhd = qel->next;
314 if(!xmQhd) xmQtl = NULL;
315 }
316 spin_unlock_irqrestore(&txqueue_lock, flags);
317
318 if ((debug & DEBUG_LOWER) && qel) {
319 int n;
320 printk(KERN_DEBUG "ltpc: dequeued command ");
321 n = qel->cbuflen;
322 if (n>100) n=100;
323 for(i=0;i<n;i++) printk("%02x ",qel->cbuf[i]);
324 printk("\n");
325 }
326
327 return qel;
328}
329
330/* and... the queue elements we'll be using */
331static struct xmitQel qels[16];
332
333/* and their corresponding mailboxes */
334static unsigned char mailbox[16];
335static unsigned char mboxinuse[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
336
337static int wait_timeout(struct net_device *dev, int c)
338{
339 /* returns true if it stayed c */
340 /* this uses base+6, but it's ok */
341 int i;
342
343 /* twenty second or so total */
344
345 for(i=0;i<200000;i++) {
346 if ( c != inb_p(dev->base_addr+6) ) return 0;
347 udelay(100);
348 }
349 return 1; /* timed out */
350}
351
352/* get the first free mailbox */
353
354static int getmbox(void)
355{
356 unsigned long flags;
357 int i;
358
359 spin_lock_irqsave(&mbox_lock, flags);
360 for(i=1;i<16;i++) if(!mboxinuse[i]) {
361 mboxinuse[i]=1;
362 spin_unlock_irqrestore(&mbox_lock, flags);
363 return i;
364 }
365 spin_unlock_irqrestore(&mbox_lock, flags);
366 return 0;
367}
368
369/* read a command from the card */
370static void handlefc(struct net_device *dev)
371{
372 /* called *only* from idle, non-reentrant */
373 int dma = dev->dma;
374 int base = dev->base_addr;
375 unsigned long flags;
376
377
378 flags=claim_dma_lock();
379 disable_dma(dma);
380 clear_dma_ff(dma);
381 set_dma_mode(dma,DMA_MODE_READ);
382 set_dma_addr(dma,virt_to_bus(ltdmacbuf));
383 set_dma_count(dma,50);
384 enable_dma(dma);
385 release_dma_lock(flags);
386
387 inb_p(base+3);
388 inb_p(base+2);
389
390 if ( wait_timeout(dev,0xfc) ) printk("timed out in handlefc\n");
391}
392
393/* read data from the card */
394static void handlefd(struct net_device *dev)
395{
396 int dma = dev->dma;
397 int base = dev->base_addr;
398 unsigned long flags;
399
400 flags=claim_dma_lock();
401 disable_dma(dma);
402 clear_dma_ff(dma);
403 set_dma_mode(dma,DMA_MODE_READ);
404 set_dma_addr(dma,virt_to_bus(ltdmabuf));
405 set_dma_count(dma,800);
406 enable_dma(dma);
407 release_dma_lock(flags);
408
409 inb_p(base+3);
410 inb_p(base+2);
411
412 if ( wait_timeout(dev,0xfd) ) printk("timed out in handlefd\n");
413 sendup_buffer(dev);
414}
415
416static void handlewrite(struct net_device *dev)
417{
418 /* called *only* from idle, non-reentrant */
419 /* on entry, 0xfb and ltdmabuf holds data */
420 int dma = dev->dma;
421 int base = dev->base_addr;
422 unsigned long flags;
423
424 flags=claim_dma_lock();
425 disable_dma(dma);
426 clear_dma_ff(dma);
427 set_dma_mode(dma,DMA_MODE_WRITE);
428 set_dma_addr(dma,virt_to_bus(ltdmabuf));
429 set_dma_count(dma,800);
430 enable_dma(dma);
431 release_dma_lock(flags);
432
433 inb_p(base+3);
434 inb_p(base+2);
435
436 if ( wait_timeout(dev,0xfb) ) {
437 flags=claim_dma_lock();
438 printk("timed out in handlewrite, dma res %d\n",
439 get_dma_residue(dev->dma) );
440 release_dma_lock(flags);
441 }
442}
443
444static void handleread(struct net_device *dev)
445{
446 /* on entry, 0xfb */
447 /* on exit, ltdmabuf holds data */
448 int dma = dev->dma;
449 int base = dev->base_addr;
450 unsigned long flags;
451
452
453 flags=claim_dma_lock();
454 disable_dma(dma);
455 clear_dma_ff(dma);
456 set_dma_mode(dma,DMA_MODE_READ);
457 set_dma_addr(dma,virt_to_bus(ltdmabuf));
458 set_dma_count(dma,800);
459 enable_dma(dma);
460 release_dma_lock(flags);
461
462 inb_p(base+3);
463 inb_p(base+2);
464 if ( wait_timeout(dev,0xfb) ) printk("timed out in handleread\n");
465}
466
467static void handlecommand(struct net_device *dev)
468{
469 /* on entry, 0xfa and ltdmacbuf holds command */
470 int dma = dev->dma;
471 int base = dev->base_addr;
472 unsigned long flags;
473
474 flags=claim_dma_lock();
475 disable_dma(dma);
476 clear_dma_ff(dma);
477 set_dma_mode(dma,DMA_MODE_WRITE);
478 set_dma_addr(dma,virt_to_bus(ltdmacbuf));
479 set_dma_count(dma,50);
480 enable_dma(dma);
481 release_dma_lock(flags);
482 inb_p(base+3);
483 inb_p(base+2);
484 if ( wait_timeout(dev,0xfa) ) printk("timed out in handlecommand\n");
485}
486
487/* ready made command for getting the result from the card */
488static unsigned char rescbuf[2] = {LT_GETRESULT,0};
489static unsigned char resdbuf[2];
490
491static int QInIdle;
492
493/* idle expects to be called with the IRQ line high -- either because of
494 * an interrupt, or because the line is tri-stated
495 */
496
497static void idle(struct net_device *dev)
498{
499 unsigned long flags;
500 int state;
501 /* FIXME This is initialized to shut the warning up, but I need to
502 * think this through again.
503 */
504 struct xmitQel *q = NULL;
505 int oops;
506 int i;
507 int base = dev->base_addr;
508
509 spin_lock_irqsave(&txqueue_lock, flags);
510 if(QInIdle) {
511 spin_unlock_irqrestore(&txqueue_lock, flags);
512 return;
513 }
514 QInIdle = 1;
515 spin_unlock_irqrestore(&txqueue_lock, flags);
516
517 /* this tri-states the IRQ line */
518 (void) inb_p(base+6);
519
520 oops = 100;
521
522loop:
523 if (0>oops--) {
524 printk("idle: looped too many times\n");
525 goto done;
526 }
527
528 state = inb_p(base+6);
529 if (state != inb_p(base+6)) goto loop;
530
531 switch(state) {
532 case 0xfc:
533 /* incoming command */
534 if (debug & DEBUG_LOWER) printk("idle: fc\n");
535 handlefc(dev);
536 break;
537 case 0xfd:
538 /* incoming data */
539 if(debug & DEBUG_LOWER) printk("idle: fd\n");
540 handlefd(dev);
541 break;
542 case 0xf9:
543 /* result ready */
544 if (debug & DEBUG_LOWER) printk("idle: f9\n");
545 if(!mboxinuse[0]) {
546 mboxinuse[0] = 1;
547 qels[0].cbuf = rescbuf;
548 qels[0].cbuflen = 2;
549 qels[0].dbuf = resdbuf;
550 qels[0].dbuflen = 2;
551 qels[0].QWrite = 0;
552 qels[0].mailbox = 0;
553 enQ(&qels[0]);
554 }
555 inb_p(dev->base_addr+1);
556 inb_p(dev->base_addr+0);
557 if( wait_timeout(dev,0xf9) )
558 printk("timed out idle f9\n");
559 break;
560 case 0xf8:
561 /* ?? */
562 if (xmQhd) {
563 inb_p(dev->base_addr+1);
564 inb_p(dev->base_addr+0);
565 if(wait_timeout(dev,0xf8) )
566 printk("timed out idle f8\n");
567 } else {
568 goto done;
569 }
570 break;
571 case 0xfa:
572 /* waiting for command */
573 if(debug & DEBUG_LOWER) printk("idle: fa\n");
574 if (xmQhd) {
575 q=deQ();
576 memcpy(ltdmacbuf,q->cbuf,q->cbuflen);
577 ltdmacbuf[1] = q->mailbox;
578 if (debug>1) {
579 int n;
580 printk("ltpc: sent command ");
581 n = q->cbuflen;
582 if (n>100) n=100;
583 for(i=0;i<n;i++)
584 printk("%02x ",ltdmacbuf[i]);
585 printk("\n");
586 }
587 handlecommand(dev);
588 if(0xfa==inb_p(base+6)) {
589 /* we timed out, so return */
590 goto done;
591 }
592 } else {
593 /* we don't seem to have a command */
594 if (!mboxinuse[0]) {
595 mboxinuse[0] = 1;
596 qels[0].cbuf = rescbuf;
597 qels[0].cbuflen = 2;
598 qels[0].dbuf = resdbuf;
599 qels[0].dbuflen = 2;
600 qels[0].QWrite = 0;
601 qels[0].mailbox = 0;
602 enQ(&qels[0]);
603 } else {
604 printk("trouble: response command already queued\n");
605 goto done;
606 }
607 }
608 break;
609 case 0Xfb:
610 /* data transfer ready */
611 if(debug & DEBUG_LOWER) printk("idle: fb\n");
612 if(q->QWrite) {
613 memcpy(ltdmabuf,q->dbuf,q->dbuflen);
614 handlewrite(dev);
615 } else {
616 handleread(dev);
617 /* non-zero mailbox numbers are for
618 commmands, 0 is for GETRESULT
619 requests */
620 if(q->mailbox) {
621 memcpy(q->dbuf,ltdmabuf,q->dbuflen);
622 } else {
623 /* this was a result */
624 mailbox[ 0x0f & ltdmabuf[0] ] = ltdmabuf[1];
625 mboxinuse[0]=0;
626 }
627 }
628 break;
629 }
630 goto loop;
631
632done:
633 QInIdle=0;
634
635 /* now set the interrupts back as appropriate */
636 /* the first read takes it out of tri-state (but still high) */
637 /* the second resets it */
638 /* note that after this point, any read of base+6 will
639 trigger an interrupt */
640
641 if (dev->irq) {
642 inb_p(base+7);
643 inb_p(base+7);
644 }
645 return;
646}
647
648
649static int do_write(struct net_device *dev, void *cbuf, int cbuflen,
650 void *dbuf, int dbuflen)
651{
652
653 int i = getmbox();
654 int ret;
655
656 if(i) {
657 qels[i].cbuf = (unsigned char *) cbuf;
658 qels[i].cbuflen = cbuflen;
659 qels[i].dbuf = (unsigned char *) dbuf;
660 qels[i].dbuflen = dbuflen;
661 qels[i].QWrite = 1;
662 qels[i].mailbox = i; /* this should be initted rather */
663 enQ(&qels[i]);
664 idle(dev);
665 ret = mailbox[i];
666 mboxinuse[i]=0;
667 return ret;
668 }
669 printk("ltpc: could not allocate mbox\n");
670 return -1;
671}
672
673static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
674 void *dbuf, int dbuflen)
675{
676
677 int i = getmbox();
678 int ret;
679
680 if(i) {
681 qels[i].cbuf = (unsigned char *) cbuf;
682 qels[i].cbuflen = cbuflen;
683 qels[i].dbuf = (unsigned char *) dbuf;
684 qels[i].dbuflen = dbuflen;
685 qels[i].QWrite = 0;
686 qels[i].mailbox = i; /* this should be initted rather */
687 enQ(&qels[i]);
688 idle(dev);
689 ret = mailbox[i];
690 mboxinuse[i]=0;
691 return ret;
692 }
693 printk("ltpc: could not allocate mbox\n");
694 return -1;
695}
696
697/* end of idle handlers -- what should be seen is do_read, do_write */
698
699static struct timer_list ltpc_timer;
700
701static int ltpc_xmit(struct sk_buff *skb, struct net_device *dev);
702static struct net_device_stats *ltpc_get_stats(struct net_device *dev);
703
704static int read_30 ( struct net_device *dev)
705{
706 lt_command c;
707 c.getflags.command = LT_GETFLAGS;
708 return do_read(dev, &c, sizeof(c.getflags),&c,0);
709}
710
711static int set_30 (struct net_device *dev,int x)
712{
713 lt_command c;
714 c.setflags.command = LT_SETFLAGS;
715 c.setflags.flags = x;
716 return do_write(dev, &c, sizeof(c.setflags),&c,0);
717}
718
719/* LLAP to DDP translation */
720
721static int sendup_buffer (struct net_device *dev)
722{
723 /* on entry, command is in ltdmacbuf, data in ltdmabuf */
724 /* called from idle, non-reentrant */
725
726 int dnode, snode, llaptype, len;
727 int sklen;
728 struct sk_buff *skb;
729 struct net_device_stats *stats = &((struct ltpc_private *)dev->priv)->stats;
730 struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;
731
732 if (ltc->command != LT_RCVLAP) {
733 printk("unknown command 0x%02x from ltpc card\n",ltc->command);
734 return(-1);
735 }
736 dnode = ltc->dnode;
737 snode = ltc->snode;
738 llaptype = ltc->laptype;
739 len = ltc->length;
740
741 sklen = len;
742 if (llaptype == 1)
743 sklen += 8; /* correct for short ddp */
744 if(sklen > 800) {
745 printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
746 dev->name,sklen);
747 return -1;
748 }
749
750 if ( (llaptype==0) || (llaptype>2) ) {
751 printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
752 return -1;
753 }
754
755
756 skb = dev_alloc_skb(3+sklen);
757 if (skb == NULL)
758 {
759 printk("%s: dropping packet due to memory squeeze.\n",
760 dev->name);
761 return -1;
762 }
763 skb->dev = dev;
764
765 if (sklen > len)
766 skb_reserve(skb,8);
767 skb_put(skb,len+3);
768 skb->protocol = htons(ETH_P_LOCALTALK);
769 /* add LLAP header */
770 skb->data[0] = dnode;
771 skb->data[1] = snode;
772 skb->data[2] = llaptype;
773 skb->mac.raw = skb->data; /* save pointer to llap header */
774 skb_pull(skb,3);
775
776 /* copy ddp(s,e)hdr + contents */
777 memcpy(skb->data,(void*)ltdmabuf,len);
778
779 skb->h.raw = skb->data;
780
781 stats->rx_packets++;
782 stats->rx_bytes+=skb->len;
783
784 /* toss it onwards */
785 netif_rx(skb);
786 dev->last_rx = jiffies;
787 return 0;
788}
789
790/* the handler for the board interrupt */
791
792static irqreturn_t
793ltpc_interrupt(int irq, void *dev_id, struct pt_regs *reg_ptr)
794{
795 struct net_device *dev = dev_id;
796
797 if (dev==NULL) {
798 printk("ltpc_interrupt: unknown device.\n");
799 return IRQ_NONE;
800 }
801
802 inb_p(dev->base_addr+6); /* disable further interrupts from board */
803
804 idle(dev); /* handle whatever is coming in */
805
806 /* idle re-enables interrupts from board */
807
808 return IRQ_HANDLED;
809}
810
811/***
812 *
813 * The ioctls that the driver responds to are:
814 *
815 * SIOCSIFADDR -- do probe using the passed node hint.
816 * SIOCGIFADDR -- return net, node.
817 *
818 * some of this stuff should be done elsewhere.
819 *
820 ***/
821
822static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
823{
824 struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
825 /* we'll keep the localtalk node address in dev->pa_addr */
826 struct atalk_addr *aa = &((struct ltpc_private *)dev->priv)->my_addr;
827 struct lt_init c;
828 int ltflags;
829
830 if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");
831
832 switch(cmd) {
833 case SIOCSIFADDR:
834
835 aa->s_net = sa->sat_addr.s_net;
836
837 /* this does the probe and returns the node addr */
838 c.command = LT_INIT;
839 c.hint = sa->sat_addr.s_node;
840
841 aa->s_node = do_read(dev,&c,sizeof(c),&c,0);
842
843 /* get all llap frames raw */
844 ltflags = read_30(dev);
845 ltflags |= LT_FLAG_ALLLAP;
846 set_30 (dev,ltflags);
847
848 dev->broadcast[0] = 0xFF;
849 dev->dev_addr[0] = aa->s_node;
850
851 dev->addr_len=1;
852
853 return 0;
854
855 case SIOCGIFADDR:
856
857 sa->sat_addr.s_net = aa->s_net;
858 sa->sat_addr.s_node = aa->s_node;
859
860 return 0;
861
862 default:
863 return -EINVAL;
864 }
865}
866
867static void set_multicast_list(struct net_device *dev)
868{
869 /* This needs to be present to keep netatalk happy. */
870 /* Actually netatalk needs fixing! */
871}
872
873static int ltpc_hard_header (struct sk_buff *skb, struct net_device *dev,
874 unsigned short type, void *daddr, void *saddr, unsigned len)
875{
876 if(debug & DEBUG_VERBOSE)
877 printk("ltpc_hard_header called for device %s\n",
878 dev->name);
879 return 0;
880}
881
882static int ltpc_poll_counter;
883
884static void ltpc_poll(unsigned long l)
885{
886 struct net_device *dev = (struct net_device *) l;
887
888 del_timer(&ltpc_timer);
889
890 if(debug & DEBUG_VERBOSE) {
891 if (!ltpc_poll_counter) {
892 ltpc_poll_counter = 50;
893 printk("ltpc poll is alive\n");
894 }
895 ltpc_poll_counter--;
896 }
897
898 if (!dev)
899 return; /* we've been downed */
900
901 /* poll 20 times per second */
902 idle(dev);
903 ltpc_timer.expires = jiffies + HZ/20;
904
905 add_timer(&ltpc_timer);
906}
907
908/* DDP to LLAP translation */
909
910static int ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
911{
912 /* in kernel 1.3.xx, on entry skb->data points to ddp header,
913 * and skb->len is the length of the ddp data + ddp header
914 */
915
916 struct net_device_stats *stats = &((struct ltpc_private *)dev->priv)->stats;
917
918 int i;
919 struct lt_sendlap cbuf;
920
921 cbuf.command = LT_SENDLAP;
922 cbuf.dnode = skb->data[0];
923 cbuf.laptype = skb->data[2];
924 skb_pull(skb,3); /* skip past LLAP header */
925 cbuf.length = skb->len; /* this is host order */
926 skb->h.raw=skb->data;
927
928 if(debug & DEBUG_UPPER) {
929 printk("command ");
930 for(i=0;i<6;i++)
931 printk("%02x ",((unsigned char *)&cbuf)[i]);
932 printk("\n");
933 }
934
935 do_write(dev,&cbuf,sizeof(cbuf),skb->h.raw,skb->len);
936
937 if(debug & DEBUG_UPPER) {
938 printk("sent %d ddp bytes\n",skb->len);
939 for(i=0;i<skb->len;i++) printk("%02x ",skb->h.raw[i]);
940 printk("\n");
941 }
942
943 stats->tx_packets++;
944 stats->tx_bytes+=skb->len;
945
946 dev_kfree_skb(skb);
947 return 0;
948}
949
950static struct net_device_stats *ltpc_get_stats(struct net_device *dev)
951{
952 struct net_device_stats *stats = &((struct ltpc_private *) dev->priv)->stats;
953 return stats;
954}
955
956/* initialization stuff */
957
958static int __init ltpc_probe_dma(int base, int dma)
959{
960 int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
961 unsigned long timeout;
962 unsigned long f;
963
964 if (want & 1) {
965 if (request_dma(1,"ltpc")) {
966 want &= ~1;
967 } else {
968 f=claim_dma_lock();
969 disable_dma(1);
970 clear_dma_ff(1);
971 set_dma_mode(1,DMA_MODE_WRITE);
972 set_dma_addr(1,virt_to_bus(ltdmabuf));
973 set_dma_count(1,sizeof(struct lt_mem));
974 enable_dma(1);
975 release_dma_lock(f);
976 }
977 }
978 if (want & 2) {
979 if (request_dma(3,"ltpc")) {
980 want &= ~2;
981 } else {
982 f=claim_dma_lock();
983 disable_dma(3);
984 clear_dma_ff(3);
985 set_dma_mode(3,DMA_MODE_WRITE);
986 set_dma_addr(3,virt_to_bus(ltdmabuf));
987 set_dma_count(3,sizeof(struct lt_mem));
988 enable_dma(3);
989 release_dma_lock(f);
990 }
991 }
992 /* set up request */
993
994 /* FIXME -- do timings better! */
995
996 ltdmabuf[0] = LT_READMEM;
997 ltdmabuf[1] = 1; /* mailbox */
998 ltdmabuf[2] = 0; ltdmabuf[3] = 0; /* address */
999 ltdmabuf[4] = 0; ltdmabuf[5] = 1; /* read 0x0100 bytes */
1000 ltdmabuf[6] = 0; /* dunno if this is necessary */
1001
1002 inb_p(io+1);
1003 inb_p(io+0);
1004 timeout = jiffies+100*HZ/100;
1005 while(time_before(jiffies, timeout)) {
1006 if ( 0xfa == inb_p(io+6) ) break;
1007 }
1008
1009 inb_p(io+3);
1010 inb_p(io+2);
1011 while(time_before(jiffies, timeout)) {
1012 if ( 0xfb == inb_p(io+6) ) break;
1013 }
1014
1015 /* release the other dma channel (if we opened both of them) */
1016
1017 if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
1018 want &= ~2;
1019 free_dma(3);
1020 }
1021
1022 if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
1023 want &= ~1;
1024 free_dma(1);
1025 }
1026
1027 if (!want)
1028 return 0;
1029
1030 return (want & 2) ? 3 : 1;
1031}
1032
1033struct net_device * __init ltpc_probe(void)
1034{
1035 struct net_device *dev;
1036 int err = -ENOMEM;
1037 int x=0,y=0;
1038 int autoirq;
1039 unsigned long f;
1040 unsigned long timeout;
1041
1042 dev = alloc_netdev(sizeof(struct ltpc_private), "lt%d", ltalk_setup);
1043 if (!dev)
1044 goto out;
1045
1046 SET_MODULE_OWNER(dev);
1047
1048 /* probe for the I/O port address */
1049
1050 if (io != 0x240 && request_region(0x220,8,"ltpc")) {
1051 x = inb_p(0x220+6);
1052 if ( (x!=0xff) && (x>=0xf0) ) {
1053 io = 0x220;
1054 goto got_port;
1055 }
1056 release_region(0x220,8);
1057 }
1058 if (io != 0x220 && request_region(0x240,8,"ltpc")) {
1059 y = inb_p(0x240+6);
1060 if ( (y!=0xff) && (y>=0xf0) ){
1061 io = 0x240;
1062 goto got_port;
1063 }
1064 release_region(0x240,8);
1065 }
1066
1067 /* give up in despair */
1068 printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
1069 err = -ENODEV;
1070 goto out1;
1071
1072 got_port:
1073 /* probe for the IRQ line */
1074 if (irq < 2) {
1075 unsigned long irq_mask;
1076
1077 irq_mask = probe_irq_on();
1078 /* reset the interrupt line */
1079 inb_p(io+7);
1080 inb_p(io+7);
1081 /* trigger an interrupt (I hope) */
1082 inb_p(io+6);
1083 mdelay(2);
1084 autoirq = probe_irq_off(irq_mask);
1085
1086 if (autoirq == 0) {
1087 printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
1088 } else {
1089 irq = autoirq;
1090 }
1091 }
1092
1093 /* allocate a DMA buffer */
1094 ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
1095 if (!ltdmabuf) {
1096 printk(KERN_ERR "ltpc: mem alloc failed\n");
1097 err = -ENOMEM;
1098 goto out2;
1099 }
1100
1101 ltdmacbuf = &ltdmabuf[800];
1102
1103 if(debug & DEBUG_VERBOSE) {
1104 printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
1105 }
1106
1107 /* reset the card */
1108
1109 inb_p(io+1);
1110 inb_p(io+3);
1111
1112 set_current_state(TASK_UNINTERRUPTIBLE);
1113 schedule_timeout(2*HZ/100);
1114
1115 inb_p(io+0);
1116 inb_p(io+2);
1117 inb_p(io+7); /* clear reset */
1118 inb_p(io+4);
1119 inb_p(io+5);
1120 inb_p(io+5); /* enable dma */
1121 inb_p(io+6); /* tri-state interrupt line */
1122
1123 set_current_state(TASK_UNINTERRUPTIBLE);
1124 schedule_timeout(HZ);
1125
1126 /* now, figure out which dma channel we're using, unless it's
1127 already been specified */
1128 /* well, 0 is a legal DMA channel, but the LTPC card doesn't
1129 use it... */
1130 dma = ltpc_probe_dma(io, dma);
1131 if (!dma) { /* no dma channel */
1132 printk(KERN_ERR "No DMA channel found on ltpc card.\n");
1133 err = -ENODEV;
1134 goto out3;
1135 }
1136
1137 /* print out friendly message */
1138 if(irq)
1139 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
1140 else
1141 printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d. Using polled mode.\n",io,dma);
1142
1143 /* Fill in the fields of the device structure with ethernet-generic values. */
1144 dev->hard_start_xmit = ltpc_xmit;
1145 dev->hard_header = ltpc_hard_header;
1146 dev->get_stats = ltpc_get_stats;
1147
1148 /* add the ltpc-specific things */
1149 dev->do_ioctl = &ltpc_ioctl;
1150
1151 dev->set_multicast_list = &set_multicast_list;
1152 dev->mc_list = NULL;
1153 dev->base_addr = io;
1154 dev->irq = irq;
1155 dev->dma = dma;
1156
1157 /* the card will want to send a result at this point */
1158 /* (I think... leaving out this part makes the kernel crash,
1159 so I put it back in...) */
1160
1161 f=claim_dma_lock();
1162 disable_dma(dma);
1163 clear_dma_ff(dma);
1164 set_dma_mode(dma,DMA_MODE_READ);
1165 set_dma_addr(dma,virt_to_bus(ltdmabuf));
1166 set_dma_count(dma,0x100);
1167 enable_dma(dma);
1168 release_dma_lock(f);
1169
1170 (void) inb_p(io+3);
1171 (void) inb_p(io+2);
1172 timeout = jiffies+100*HZ/100;
1173
1174 while(time_before(jiffies, timeout)) {
1175 if( 0xf9 == inb_p(io+6))
1176 break;
1177 schedule();
1178 }
1179
1180 if(debug & DEBUG_VERBOSE) {
1181 printk("setting up timer and irq\n");
1182 }
1183
1184 /* grab it and don't let go :-) */
1185 if (irq && request_irq( irq, &ltpc_interrupt, 0, "ltpc", dev) >= 0)
1186 {
1187 (void) inb_p(io+7); /* enable interrupts from board */
1188 (void) inb_p(io+7); /* and reset irq line */
1189 } else {
1190 if( irq )
1191 printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
1192 dev->irq = 0;
1193 /* polled mode -- 20 times per second */
1194 /* this is really, really slow... should it poll more often? */
1195 init_timer(&ltpc_timer);
1196 ltpc_timer.function=ltpc_poll;
1197 ltpc_timer.data = (unsigned long) dev;
1198
1199 ltpc_timer.expires = jiffies + HZ/20;
1200 add_timer(&ltpc_timer);
1201 }
1202 err = register_netdev(dev);
1203 if (err)
1204 goto out4;
1205
1206 return NULL;
1207out4:
1208 del_timer_sync(&ltpc_timer);
1209 if (dev->irq)
1210 free_irq(dev->irq, dev);
1211out3:
1212 free_pages((unsigned long)ltdmabuf, get_order(1000));
1213out2:
1214 release_region(io, 8);
1215out1:
1216 free_netdev(dev);
1217out:
1218 return ERR_PTR(err);
1219}
1220
1221#ifndef MODULE
1222/* handles "ltpc=io,irq,dma" kernel command lines */
1223static int __init ltpc_setup(char *str)
1224{
1225 int ints[5];
1226
1227 str = get_options(str, ARRAY_SIZE(ints), ints);
1228
1229 if (ints[0] == 0) {
1230 if (str && !strncmp(str, "auto", 4)) {
1231 /* do nothing :-) */
1232 }
1233 else {
1234 /* usage message */
1235 printk (KERN_ERR
1236 "ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
1237 return 0;
1238 }
1239 } else {
1240 io = ints[1];
1241 if (ints[0] > 1) {
1242 irq = ints[2];
1243 }
1244 if (ints[0] > 2) {
1245 dma = ints[3];
1246 }
1247 /* ignore any other paramters */
1248 }
1249 return 1;
1250}
1251
1252__setup("ltpc=", ltpc_setup);
1253#endif /* MODULE */
1254
1255static struct net_device *dev_ltpc;
1256
1257#ifdef MODULE
1258
1259MODULE_LICENSE("GPL");
1260module_param(debug, int, 0);
1261module_param(io, int, 0);
1262module_param(irq, int, 0);
1263module_param(dma, int, 0);
1264
1265
1266int __init init_module(void)
1267{
1268 if(io == 0)
1269 printk(KERN_NOTICE
1270 "ltpc: Autoprobing is not recommended for modules\n");
1271
1272 dev_ltpc = ltpc_probe();
1273 if (IS_ERR(dev_ltpc))
1274 return PTR_ERR(dev_ltpc);
1275 return 0;
1276}
1277#endif
1278
1279static void __exit ltpc_cleanup(void)
1280{
1281
1282 if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
1283 unregister_netdev(dev_ltpc);
1284
1285 ltpc_timer.data = 0; /* signal the poll routine that we're done */
1286
1287 del_timer_sync(&ltpc_timer);
1288
1289 if(debug & DEBUG_VERBOSE) printk("freeing irq\n");
1290
1291 if (dev_ltpc->irq)
1292 free_irq(dev_ltpc->irq, dev_ltpc);
1293
1294 if(debug & DEBUG_VERBOSE) printk("freeing dma\n");
1295
1296 if (dev_ltpc->dma)
1297 free_dma(dev_ltpc->dma);
1298
1299 if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");
1300
1301 if (dev_ltpc->base_addr)
1302 release_region(dev_ltpc->base_addr,8);
1303
1304 free_netdev(dev_ltpc);
1305
1306 if(debug & DEBUG_VERBOSE) printk("free_pages\n");
1307
1308 free_pages( (unsigned long) ltdmabuf, get_order(1000));
1309
1310 if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
1311}
1312
1313module_exit(ltpc_cleanup);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-04 10:16:17 -0500